On hearing your question, I know that it is possible that you are Beijing, right, each other, we also often encountered this kind of problem, it is recommended that more than 150 wear a mask, more than 200 do not go to the outdoor dance, get a small speaker in the home to dance, our team is so dealt with, health is most important. The haze is too harmful to people, is cumulative, can not be ignored.
I hope my answer is helpful to you
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